JSBT50(T) Safety Relay/Expansion Relay
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Technical Data
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Manufacturer.................................. JOKAB SAFETY
Ordering Data............... JSBT50 operating voltage
and JSBT50T
Color................................................. black and beige
Weight................................................................ 200 g
Power Supply....................... 24 VDC,+/-15%/-25%
Power Consumption....................................... <2 VA
Relay Outputs....................................... 3 NO + 1 NC
Maximum switching
capacity res. load AC............. 6A/250 VAC/1500 VA
Maximum switching
capacity res. load DC................. 6A/24 VDC/150 W
Minimum switching load........................ 10mA/10 V
(if load on contact has not exceeded 100 mA)
Maximum input wire
res. at nom. voltage................................... 200 Ohm
Response Time
At deactivation............................ <60 ms or delayed
max. 500 ms (JSBT50T)
Mounting.......................................... 35 mm DIN rail
Terminals
Maximum screw torque................................... 1 Nm
Single strand......................................... 2x1.5mm2
Conductor
with socket contact.................................. 2x1mm2
Air and creep distance............. 4kV/2 IEC 60664-1
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Operating Temperature
Range................................................ -10ºC to +55ºC
Function Indication...................... Electrical supply,
relay and X4
Protection Class
Enclosure....................................... IP 40 IEC 60529
Terminals....................................... IP 20 IEC 60529
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Technical Description
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When supply voltage is connected to A1 and A2, relays K1 and K2 are activated. K1 and K2 drop if the supply voltage is disconnected. Both relays K1 and K2 must drop for them to be activated again. Another requirement is that the test circuit, A1-X4, can either be open constantly closed.
The supervising circuit ensures that both K1 and K2 have dropped before they can be reactivated. The stop function complies with the requirement that a component fault or external interference cannot lead to a dangerous function.
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 The safety outputs consist of contacts from K1 and K2 connected internally in series across terminals 13 - 14, 23 - 24, and 33 - 34. These contacts are used to cut the power to components which stop or prevent hazardous movements/functions. It is recommended that all switched loads are adequately suppressed and/or fused in order to provide additional protection for the safety contacts.
The NC output 41 - 42 should only be used for monitoring purposes e.g. indication lamp for emergency stop pressed.
JSBT50T Info. Output
JSBT50T Delay Times
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Electrical Connections
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Emergency stop with reset when emergency button returns.
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Controlled monitoring of external contactor, relay, valve or JOKAB SAFETY's expansion relays.
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Emergency stop with dual connection direct to the supply voltage.
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JSBT50 as emergency stop and control relay with Start and Stop function.
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Hatch with automatic reset.
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Monitoring to ensure that the On button is not stuck in pressed position. A short circuit over the closing contact is not monitored.
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